Starting with fresh whole blood, the CD33+ cell content of the isolated fraction is typically 96 ± 2% (mean ± SD) using “The Big Easy” EasySep™ Magnet. In the above example, the purities of the start (as assessed by labeling with anti-CD33) and the final isolated fractions are 68.0% and 96.2% (as assessed by labeling with anti-CD14 and anti-CD66b), respectively. NOTE: RBCs were removed from the start sample by lysis prior to flow cytometry.
Antibody-Mediated LILRB2-Receptor Antagonism Induces Human Myeloid-Derived Suppressor Cells to Kill Mycobacterium tuberculosis. V. K. Singh et al. Frontiers in immunology 2022
Abstract
Tuberculosis is a leading cause of death in mankind due to infectious agents, and Mycobacterium tuberculosis (Mtb) infects and survives in macrophages (MФs). Although MФs are a major niche, myeloid-derived suppressor cells (MDSCs) are an alternative site for pathogen persistence. Both MФs and MDSCs express varying levels of leukocyte immunoglobulin-like receptor B (LILRB), which regulate the myeloid cell suppressive function. Herein, we demonstrate that antagonism of LILRB2 by a monoclonal antibody (mab) induced a switch of human MDSCs towards an M1-macrophage phenotype, increasing the killing of intracellular Mtb. Mab-mediated antagonism of LILRB2 alone and its combination with a pharmacological blockade of SHP1/2 phosphatase increased proinflammatory cytokine responses and phosphorylation of ERK1/2, p38 MAPK, and NF-kB in Mtb-infected MDSCs. LILRB2 antagonism also upregulated anti-mycobacterial iNOS gene expression and an increase in both nitric oxide and reactive oxygen species synthesis. Because genes associated with the anti-mycobacterial function of M1-MФs were enhanced in MDSCs following mab treatment, we propose that LILRB2 antagonism reprograms MDSCs from an immunosuppressive state towards a pro-inflammatory phenotype that kills Mtb. LILRB2 is therefore a novel therapeutic target for eradicating Mtb in MDSCs.
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种属
Human
Magnet Compatibility
• “The Big Easy” EasySep™ Magnet (Catalog #18001) • EasyEights™ EasySep™ Magnet (Catalog #18103) • RoboSep™-S (Catalog #21000)
EasySep™小鼠TIL（CD45）正选试剂盒
